//
//  WelComeViewController.swift
//  Three-SinaWeibo
//
//  Created by 李旭阳 on 15/11/17.
//  Copyright © 2015年 apple. All rights reserved.
//

import UIKit
import SnapKit
import SDWebImage

class WelComeViewController: UIViewController {

    override func loadView() {
        view = backImage
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        startAnimation()
    }
    
    //MARK: 动画
    private func startAnimation() {
        self.iconImage.snp_updateConstraints { (make) -> Void in
            make.bottom.equalTo(self.view.snp_bottom).offset(-self.view.bounds.height + 180)
        }
        
        UIView.animateWithDuration(1.2, delay: 0, usingSpringWithDamping: 0.9, initialSpringVelocity: 9.8, options: [], animations: { () -> Void in
            //闭包内部 强制刷新页面
            //将提前收集到的约束的变化 进行更新
            self.view.layoutIfNeeded()
            }) { (_) -> Void in
                UIView.animateWithDuration(0.6, animations: { () -> Void in
                    self.welcomeLabel.alpha = 1
                    }, completion: { (_) -> Void in
                        //发出通知
                        NSNotificationCenter.defaultCenter().postNotificationName(AppSwitchRootViewControler, object: nil)
                })
        }
    }
    
    private func setupUI(){
        view.addSubview(iconImage)
        view.addSubview(welcomeLabel)
        
        iconImage.snp_makeConstraints { (make) -> Void in
            make.centerX.equalTo(view.snp_centerX)
            make.bottom.equalTo(view.snp_bottom).offset(-180)
            make.width.equalTo(90)
            make.height.equalTo(90)
        }
        
        welcomeLabel.snp_makeConstraints { (make) -> Void in
            make.top.equalTo(iconImage.snp_bottom).offset(12)
            make.centerX.equalTo(view.snp_centerX)
        }
        
        //加载图片
        iconImage.sd_setImageWithURL(UserAccountViewModel().headURL, placeholderImage: UIImage(named: "avatar_default_big"))
        
        //将图片处理成圆角
        iconImage.layer.cornerRadius = 45
        iconImage.layer.masksToBounds = true
        
    }
    
    //MARK: 懒加载
    private lazy var backImage: UIImageView = UIImageView (image: UIImage(named: "ad_background"))
    private lazy var iconImage: UIImageView = UIImageView ()
    private lazy var welcomeLabel: UILabel = {
        let l = UILabel()
        l.textColor = UIColor.lightGrayColor()
        l.font = UIFont.systemFontOfSize(16)
        l.textAlignment = .Center
        l.alpha = 0
        l.text = "欢迎归来"
        l.sizeToFit()
        
        return l
    }()
}
